This was 27.7 percent lower than the state average of 42.6 percent. In 2020 the total municipality population reached 151.
98.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Custer for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2 | 1.7 |
| Regular high school diploma | 57 | 47.1 |
| GED or alternative credential | 5 | 4.1 |
| Some college, less than 1 year | 27 | 22.3 |
| Some college, 1 or more years, no degree | 12 | 9.9 |
| Associate's degree | 3 | 2.5 |
| Bachelor's degree | 9 | 7.4 |
| Master's degree | 6 | 5 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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